package com.lbc.bq;

import java.util.concurrent.BlockingQueue;
import java.util.concurrent.SynchronousQueue;
import java.util.concurrent.TimeUnit;

/**
 *   同步队列
 *   和其他的BlockigQueue是不一样的,SynchronousQueue不存储元素
 *   put了一个元素，必须从里面先take取出来，否则不能再put进去值
 *   两次put是因为打印线程也在抢cpu
 */
public class SynchronousQueueDemo {
    public static void main(String[] args) {
        BlockingQueue<String> blockingQueue = new SynchronousQueue<>();  //  同步队列

        new Thread(()->{
            try {
                System.out.println(Thread.currentThread().getName()+" put 1");
                blockingQueue.put("1");
                System.out.println(Thread.currentThread().getName()+" put 2");
                blockingQueue.put("2");
                System.out.println(Thread.currentThread().getName()+" put 3");
                blockingQueue.put("3");
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }, "T1").start();

        new Thread(()->{
            try {
                TimeUnit.SECONDS.sleep(3);
                System.out.println(Thread.currentThread().getName()+" => "+blockingQueue.take());
                System.out.println(Thread.currentThread().getName()+" => "+blockingQueue.take());
                System.out.println(Thread.currentThread().getName()+" => "+blockingQueue.take());
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }, "T2").start();

    }
}
